Two new blue emitters, i.e., bis-[2-(9,9-dimethyl-9,10-dihydroacridine)-phenyl]-sulfone (o-ACSO2) and bis-[3-(9,9-dimethyl-9,10-dihydroacridine)-phenyl]-sulfone (m-ACSO2), with reserved fine thermally activated delayed fluorescent (TADF) nature and simply tuned thermal and optoelectronic properties, were synthesized by isomer engineering. The meta-linking compound, i.e., m-ACSO2, obtains the highest photoluminescence quantum yield with a small singlet–triplet energy gap, a moderate delayed fluorescent lifetime, excellent solubility, and neat film homogeneity. Due to its unique aggregation-induced emission (AIE) character, neat film-based heterojunction-like organic light-emitting diodes (OLEDs) are achievable. By inserting an excitonic inert exciton-blocking layer, the PN heterojunction-like emission accompanied by intefacial exciplex was shifted to a homojunction-like channel mainly from the AIE emitter itself, providing a new tactic to generate efficient blue color from neat films. The solution-processed nondoped sky-blue OLED employing m-ACSO2 as emitter with homojunction-like emission achieved a maximum external quantum efficiency of 17.2%. The design strategies presented herein provide practical methods to construct efficient blue TADF dyes and realize high-performance blue TADF devices.

中文翻译：

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通过使用具有聚集诱导发射特性的热激活延迟荧光发射器，实现高效的溶液处理的同质结类天蓝色OLED

两个新的蓝色发射体，即双-[2-（9,9-二甲基-9,10-二氢ac啶）-苯基]-砜（o -ACSO2）和双-[3-（9,9-二甲基-9），通过异构体工程合成了具有保留的精细热活化延迟荧光（TADF）性质和简单调节的热和光电性质的10-二氢ac啶）-苯基]-砜（m -ACSO2）。所述元-linking化合物，即，米-ACSO2，获得了最高的光致发光量子产率，并具有小的单重态-三重态能隙，适度的延迟荧光寿命，出色的溶解度和整齐的膜均质性。由于其独特的聚集诱导发射（AIE）特性，因此可以实现基于薄膜的整洁的异质结状有机发光二极管（OLED）。通过插入一个激子惰性激子阻挡层，伴随着界面激基复合物的PN异质结状发射主要从AIE发射器本身转移到同质结状通道，提供了一种从整齐的薄膜中产生有效蓝色的新策略。使用m -ACSO2的溶液处理的非掺杂天蓝色OLED作为具有同质结发射的发射极，其最大外部量子效率为17.2％。本文介绍的设计策略提供了构建有效的蓝色TADF染料并实现高性能蓝色TADF装置的实用方法。